As for the spoon - if I have to I use the measuring tablespoon!
Can you give him something strong tasting beforehand (e.g. dark chocolate) and then try?
Some of the antibiotics must taste vile - we are having to use bigger bribes to get cephalexin in than we used to need for amoxil.

The doctor mentioned to me that in some cases you can get the chemist to make it up with a different flavour - don't know if that would help.